diff --git a/helpdesk/tests/test_time_spent_auto.py b/helpdesk/tests/test_time_spent_auto.py
index 6658b675..d40d2800 100644
--- a/helpdesk/tests/test_time_spent_auto.py
+++ b/helpdesk/tests/test_time_spent_auto.py
@@ -40,7 +40,6 @@ class TimeSpentAutoTestCase(TestCase):
         """Tests automatic time_spent calculation."""
         # activate automatic calculation
         helpdesk_settings.FOLLOWUP_TIME_SPENT_AUTO = True
-        helpdesk_settings.USE_TZ = True
 
         # ticket creation date, follow-up creation date, assertion value
         TEST_VALUES = (